Spin training

Very interesting discussion on spin training. Many moons ago I was teaching an English friend spins in C150. After demo several times hard left rudder then full left aileron as a stall was breaking I let him try. He got it a little out of order. Full left aileron then hard left rudder put us in an inverted spin! He didn’t ask for more. Bob also my one and only Sportsman EAA Aerobatic competition years ago I won first place. Very windy in Iowa that day and I was last. The previous four went out of the box and all I had to do was stay in. Les
Out of curiosity - is aileron input required in the C150 to start the spin? I'm also guessing the student pushed on the yoke early (right as it was breaking) to get it into a inverted spin?
 
Aileron is not needed to spin a C150. You don't push in a spin except during recovery. If you push instead of holding full up elevator you could get an outside snap. I don't want to go there in a 150. However with power off it would be a funky not really a snap. If I were teaching a student spins I would have my hand on the yoke and feet on the rudders and be ready for an inappropriate input. Hopefully I could stop it be fore it got bad.
 
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When I was taking a week long aerobatic course not too long ago, flying mostly a Decathlon, I had asked the instructor if we could do inverted spins or perhaps mess up a hammer head to get into an inverted state, then spin and recover. He did not want to and cited that the see through top window (standard on most American Champion AC) could get blown in or come loose. This was in a relatively new / recent version of the Decatlon.

Has anyone here had this happen or this concern?
 
Tony Johnstone in Florida gives every type of imaginable spin training in his late 90's super D with the skylight. You can consult the factory - I very much doubt it's of any concern - otherwise there would be a restriction for inverted spins.
 
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